peterson



@me '1.2 s, W2@ lm GJ. H. PETEFSN TELEPHONE SYSTEM Y Filed Nov. 23j 1924 DISPLAY BOR) FFO Application filed November 22, 152e.

This invention relates to tcleph one systems and .more pc ticularly to trunk circuits.

The inve n is shown as applied to a system employinn` automatic switch mechaa nisms -for extending calling subscribers lines to tandem op rators positions, provided with apiiizii'zftiis tor registerinr, and Visually indicating' the numbers oi the wanted lines. y nn these tandem positions the calls are iii nier eI-rtended over what are called straiglittorward trunks.

Upon the initiation or a call by a sub scri'rer a signal is displayed betere the tan dem operator who then actuates the display lrey associated with the displayed signal 'thereby causing; he number dialef by the subscrilier to be displayed. ritter observing,` the waited number the tandem operator in i' the phw end ol? the calling;- trunk into ingr straightforward trunk jack nd passes the necessary information to the istant sti itlorward B operator who thereupon ii ier extends the call in any suitable manner.

the patent to G. H. Peterson No. ,nl-5, issued lDf-/eember 1925. such an x. ement is itully described wherein the lil a 'on by the operator oit a positional rr liey, a'liter the number has been 30 passcfl to the distant l operator, extinguishes the trunk signal, retires the display,

and disconnects the operators telephone set. object oi this invention is to automatn y i" seonnect the operators telephone sit from a trunk and connect it to a second trunlr in case the second trunk, on which a call may be waiting', is plugged up to an Lr-unit.

'nal feature oi the invention in the provision ot posir Y ient whereby, respon- .'tion oi second incoming cttw/ring); trunl; ifl while yr objiects vvill be apparthe lolloi o; description when conn t tbe drawings.

ed by the accomthe suliscribers .c e .l in on to being` provided with 4.1 .1 ,-fif. 'r rae usual substation apparatus is also pio- ;e Lita YN, NEW YG-Fu, AEGEE-NOR 'BG iMERCj-lhl TELE- COMPANY, A. CORORATICN Qi? NEW YRK.

Serial No. 751,615.

vided with an impulse sending device Y. rEhe subscribers line is automatically con neeted to a tandem operators position, shown between the broken vertical lines aa and bb', by means of automatic switches N over trunk rlli, one of said switches selecting` an idle trunk to sender Q and this trunk in turn being; extended to the trunk TK terminatingu at the tandem operators position in the plug;` 33 adapted to be inserted in jack associated with a trunk extending to a B operators position indicated to the right of the broken line 5b.

Associated with the trunk TK at the tan dem operators position is a display board Z provided with the usual display. lamps or indicators. These lamps or .indicators are ope-rated by impulses transmitted from the sender Q in which is stored up the in pulses transmitted. by the sending device Y at the subscribers station The automatic switch hl, sender Q', and tie display board circuits are fully disclosed in the patent to A. E. Lund-ell and E. lil. Clark, 1,464,084, and will therefore not be described in detail in this specification. rEhe B operators telephone set and apparatus shown in the outline l0() is i'ully disclosed in a copending1 application, Serial Na 738,488, iiled September 18, 1924-, in the names of Messrs. S. Bailey and Broc.

The operation ot the system is as follows:

The sender Q. is automatically connected to subscribers line upon the initiation oit a call whereupon the connection is extended to the tandem opcrators trunk TK which terminates in the plug` 33. "When the call is extended to the sender Q the manipulation oit the sending device Y bythe subscriber transmits impulses corresponding` to the number of the wanted line. rl`hese impulses are received by and stored up in the sender Vifhen the connection is extended to the trunk the circuit oi: relay A is completed by the closure ot a circuit in the automatic n i a, la

LJ outer right alternate contacts of relay B to ground. ltelay B in operating also locks itself to battery at its inner right alternate contacts. rlhis relay is now held independent of the relay l. rl`he lighting of lamp L indicates to the tandem operator that a. call `s waiting' and she then presses the display key hl which closes a circuit for the open ation of relay I as follows: ground (not shown) in the display board Z, conductor G, contacts of key lvl, .left alternate contacts of relay l, left-hand winding of relay I and to battery (not shownl in the display board circuit. Relay l' in operating locks itself to ground at its right-hand alternate contarts under control of relay H in an obyious circuit an( at its outer left alternate contacts prepares a circuit for the operation of relay R. fit its inner left alternate contacts relay I completes obvious circuit for the enf ization of relay li, the operation of which completes the circuit of relay C as follows: battery, inner rright alternate contacts of relays B and lf and winding` of relay C to ground. Relay C in operating connects battery at its right-hand contacts to conductor l() extending to the winding of relay but the other terminal of the windin o` l) is likewise connected to'battery, this relay is short circuited and therefore pre- Vented from operating; at this time. The operation of relay C also completes the previously prepared circuit for relay R as follows: battery, left-hand contacts of relay C, winding); of relay R, outer left alternate contacts of relay l t0 ground (not shown) in the display hoard 'circuit Z. rllhe operation of relay ll opens the trunk conductors at its upper and lower alternate contacts and at its upper and lower alternate contacts connects the trunlr and the associated sender Q to the display hoard Zthereloy causing, in a well understood manner, the operation of the sender which thereupon transmits the stored up impulses to operate the indicators in the display equipment to display the nuu'lber of the wanted line.

lllhen relay R operates to open the trunk, it thereby opens the circuit of relay A which relay in turn removes ground from the winding of relay B, which in turn releases.

Relay B in restoring opens its inner right alternate contacts thereby removing battery from. the original energizing circuit of relay C. Relay C, however, remains operated as a holding' circuit now exists over conductor l() and the winding of relay D to battery. Relay D operates at this time due to the connection of the battery from its lower right-hand terminal and, in operating, closes an obvious energizing; circuit for relay D1.

The release of relay B, with relay K operated, transfers lamp li from the steady ground at the outer right alternate contacts of relay B to the interrupted ground through interrupt r 50. rllhis circuit can loe tracedv from hattery,`lamp L, outer right normal contacts of relay B, left alternate contacts of relay l through interrupter 50 to ground. rlhis causes lamp L to `flash thereby indicating 'to the operator that the sender has heen connected to the display board Z and after the number has been disalayed7 it indicates which trunk transmitted he number.

fatter the code impulses have all heenreceiveil, groundis removed from conductor n the display cord circuit thereby open- 'the circuit of relay which relay then ases and disconnects the trunk from the f oard and coi'ineets them to the conillien relay R restores, assuming the callsubscribers receiver is still oi't the hook, ay A is again energized over the calling trunl-. The operation of relay A at this time connects ground to the inner right contacts of relay l), and thence over conductor l0 and the righ-hand contacts and windof relay C, thereby short circuitiner it and causi it to release. Relay l) does not release however, and it will be held by this same ground supplied by relay A. This relay is, therefore, now under control of relay A.

rlhe tandem operator upon not-ing the number of the wanted line tests for an idle trunlr extending to an exchange in which the wanted line is located. Assuming that the trunlr terminating in jack Sal is idle, plug 33 is inserted therein thereby completing` the circuit of relay E as follows: battery, winding of relay E, sleeve contacts of plug 33 and jack 3e and winding; of relay 35 to ground. Relay E in operatine complet-e a circuit for the operation of relay G, as follows: battery, resistance WL, bacl'normal contacts of relay F, conductor ST, contacts 19 and winding of relay G, lowermost alternate contacts of relay E, alternate contacts of relay Dl and to ground at the left-hand normal contacts of relay H. Relay E in operating also opens at its uppermost normal contacts the connection between the tip of the plus` and the lousy test lead extending to the operators telephone set and at its uppermost alternate contacts connects conductor l0 through to the tip of the plug. Relay E in operating' also prepares, at its inner lower alternato contacts, circuit fe 1 supervisory lamp l) which circuit is, however, open the outer right'ccntacts of relay l) and therefore this lamp is not lifrhted at this time. Also, when relay E operi s, itremoves a short circuit ergizing' winding of relay H thereby preparing` this relay for operation, which will be lat-or discussed.

lllhen relay G operates, it opens at its contacts 45 and t6 the connection between the trunk conductors 26 and 2'?, and the conductors l0 and il and closes at its alternate 1om around the cn- Cil Cil

contacts 47 and 48 a connection between the operators telephone, not shown, and the conductors 40 and 4l extending through to the tip and ring` contacts ot the plug;` and jack. lt should be noted that relay J is also connected in parallel with resistance lll/'li in the operating; circuit. for relay G but relay il Will not operate in this circuit due to the very loiv value of resistance Villa. llt may be incntioned, however, that resistance lllli is inserted in the circuit for bat tery protection reasons only, and performs no other useful lunction.

Relay G in operating, locks to battery in series with relay F in an obvious circuit whereupon relay F operates, thereby disconnectingij battery, through resistance "WL, itroin the ST lead,

The operators telephone Set is now connected to the outgoing` straightforward trunk circuit extending` to the operators telephone at the B operatois position, whereupon the taudeni operator passes the number, displayed by the indicator Z, to the B operator. lt should be noted that.` as relay G is operated, the talking conductors extending back the calling subscriber, are disconnected. troni the conductors 40 and 4l, and therefore, the calling` subscriber does not hear the tandem operator pass the details o' the call to the straightforward B operator. As soon as the call has been passed, however, it is necessary tor the calling subscriber to be connected to the outgoing` trunlr and also that the tandein operators telephone set be disconnected. Both these operations will be elfected by the release of relay G which inay be caused either by the manual operation of release lrey RK, or automatically by the insertion of a second incoiningitrunlr, in another straightforward trunk jack corresponding to the jack 34 in conjunction with the operation or the display key associated with the second incominn' trunk.

lille will First acsuine that the tandeni operator has passed the call and that no calls are waiting on any of the other incoming trunlrs te 1ininating' at lier position. Under these conditions the operator will operate release hey BK, thereby connecting ground to conductor L@ and causing the operation of relay l-l Which betere mentioned, is ncrv in readiness to be operated, The circuit ttor the operation of relay ll' can be traced trein l'iattery through its energizing; Winding', and also its non-inductive Winding 5l, conductor 52, lowern'iost alternate contacts ol relay G, conductor LQ, and to ground at key RK. llelay in operating, locks itseli:l up at its lett-hand alternate contacts under control oli the l@ relay. rlhat is, it is under the control ot relay E in the sense that when plug 233 is renioved iti-oni jaclf 34, relay will release, thereby connecting` the upper terminal of relay ll and again short-circuiting it. rlhe operation or relay l-l also ieinoves the operating ground i''or relay G and therefore, this relay releases thereby disconnecting the operators telephone set and connecting the conductors e1;- tending to the callin? subscriber through to the tip and ring or the plug` which are connected to the outgoingv trunk. The operation of relay la also releases relay l which in its turn releases relay llelay l in iieleasingr, opens the flashing; circuit for lainp L. The renioval of ground at the right-hand contacts ot relay ll, which causes the release or ii'elay l, also removes around `troni the lead 5 to the display board Z and thereby releases the display mechanism to Wipe out the nuinbcr. rlhe arrangement for holding;- relay l-l operated until the plug; has been reinoved renders tie display lrey lill ineffective to cause the dispay of a second nuinbcr in the event that the trunlr TK is reselectcd after the Vfirst calling` subscriber disconnects and beifore the plug 33 has been removed 'troni jack 34.

ln the the iiianual release ot the operato telephone and the connection through ot the calling trunl, has been described.

lt will now be assuined that before the ant ein operator has :finished passing; the deot a call, a` second trunk l.anip, correir ending' to lainp li, associated with another otl the incoming' trur1 s corresjondine` to linjlits thereby in [eatingtrat a second call is awaitingv attention. lUnder these conditions in accordance with a ieature oi" Vthis invention it unnecessary igor the operator `to operate the hey RK iii order to release her telclilioue and connect the thronph, as this will t. inaticaily in response to the nl plug); ot the second truiil-r f foins' straiuh t'toiiva b riding' to jack 34, and l operation of the display liey associated ui'fh the second The arraiigygenient tor accoini feature will now be jut the lett or the draI l. rectangle .f-iurrouiided by a l;

ininon positional equipment u ot the previously ineiitioner.

battery to 'iii llU

ci an l ll an d tli will be of he i" t operated in the circuit battery, lilircue'h resi.4 lead Batt-,ry in resistance winding' oit over, connected to t other relays ond truuli nine; is outageing` trunl; jaclr, and, prov i. socizted D relay is operated, a circuit closed from battery, through the J relay, over conductor ST, normal contacts and Winding ot' the G relay ot tac second trunk, lower alternate contacts ot the E relay ot the second trunk which is now operated, due to the insertion ot the associatet ping in the jack and over the alternate contacts ot the associated Dl relay to ground, ove the normal contacts ot the associated H relay. The G reiay the second trunk .viil not operate in this circuit, however, due to the high resstance of reiay J but that operates, thereby conne-c" ground at alternate` contacts over the inner right-haalternate contacts oi relay and LG, lou'erinost alternate contacts relay of the rst trunk, conductor 5:4 nd the non-inductive and the operating ings oi relay H to battery thereby causinthis relay H to operate, as before describe( in connection With the manual operation ori lrey RK, to release the operators telephone set and conn-ct the i'irst trnni'thr outgoingline. Relay il o; in operating, releases the G trunk as previously described. ther leasing relay F of the positional circu lay F, in releasing, connects bas-te with `low resistance 'WL to thereby shouting relay J and causinIY release and at the same time s'. icient current for the operation relay oit the second trunk to cause it-s opera.- tion.

it will therefore be noted that under tno above conditions, the telephone set is auroinatically transferred from the first trunlz to the second trunk nierely by the insertion of the second trunk in an outgoing ack.

What is claimed is:

1.111 a telephone exchange system, an operators position including an operators telephone set, lirst and second plug-ended line circuits incoming to said position, a plurality or outgoing lines at said position, means jointly responsive to a call on said rst incoming line, the operation o1 a key and the connection of said calling line With one ot said outgoing lines for connecting said operator-s telephone to the seized outgoing line, and means autoinatioaily responsive to a call on said second incoming line and its connection with another ot said outVA t A outgoing lines-for connecting said telephone erators position including a telephone se a nl lit f of' incoming lines terminating at s I a pluraiity ot outgoing lines e.. Lner- "ir-oni, ineens responsive to tl iection of a calling one of said inco: lines with one ot said outgoing lines to -nnectinir teleolione set thereto,

second callingline fith a second outgoing y before said lirst connection is broken n, tor transferring said telephone set from said firstto said second connection.

' ln telepho e exchange system, an op- L:ors position including` a telephone set, a pzurality oit incoining'lines terminatingl at said position, a plurality ot' outgoing lines in i therefrom, means responsive to the connection of a calling one 'of said ino 'j lines With oneot said 'outgoing 1lines 'loi' connecting said telephone set to said going line to the exclusion ot the calling or .said incoming line, and means reonsive to the connection of a second callingi` line with a second outgoing` line before said iirst connection is broken for transferri said telephone set from said iirst outgoing line to said second outgoing line.

Y 5. ln a telephone exchange system, an operator-s position including a telephone set, plurality of incoming lines terminating at said position, a plurality ot outgoing lines extending therefrom, means responsive to the connection ot a calling one ot .said incoming lines with one of said outgoing lines for connecting said telephone set exclusively to the incoming end ot said calling line, and means responsive to the connectionV ot' a second calling line With a second outgoing line, before said first line is disconnected, for transferring` said telephoneA set from the incoming Vend of said first calling line to the incoming end of said second calling line.

6. In a telephone' exchange system, a call indictor operators position including an operators telephone set, a plurality ot line circuits incoming to said position, a plurality of outgoing line circuits extending :trom said position, a numbery display device said position, and operator controlled ineens tor causing said device to indicate the number Wanted by a calling one of .said incoming lines, means jointly responsive to the operation of said operator controlled means, and the connection of said cailing line With one of said outgoing lines for connecting said operators telephone set to the Leoeoi soif/.ed outgoing line to the exclusion of the incoming; line, and ineens automatically responsive to the connection oi a second calling); incon'iine)- line to anothei of said outgoing line du in' the 'ence of the said connection ille/tween said nist incoming' line and seid outgoing; line., Yfoi' tinnsfeiiing said opel-etoile telephone set from said iirst seized to cmid second seized outgoing line to the ion oi". t 4id second incoming` line.

7. ln conihiiwtion7 n iii-st and :i second inconnue; trunk, an operators telephone set, a 'relay individuel to each incoming; tinnk7 it plurality oit outgoing` trunk jacks, ineens controlled by its associated individual relay when one of said trunk plugs is inserted in one ot seid jacks foi" disconnecting` the talking; conductors of said trunk from the plug and for connecting said telephone set to said plug` and a. pluialitv of othei1 relays con'nnon to .said incoming ti'unks, adapted to automatically control ineens toi releasing; said .iii-st individual ielnv to disconnect the operzitors telephone and to reconnect the ti'unk conductors 'to the plug, and to opelnte the individual :velay of the second trunk to disconnect the conductors thereof from the plug and to connect the telephone set to the plug when the second plug is inserted in zlinothei1 of said jacks before the first plug Y is ienioved.

ln testimony whereof l have signed inv naine to this specification this 21st day of November, 1.924.

GEORGE H. PETERSON. 

